I recently found via Ancestry.com an entry for my third great grandfather, Gerson Heilbroner, in the 1862-1948 New York Index to Death Records. Heilbroner was mispelled Hhilbroner which was why I had not stumbled upon this before. This is definitely confirmed as my ggggrandfather as the entry mentioned his wife and daughter's name.
Questions:
1. Would the dates of the index indicate that he died 1862 and after-not before?
2. Would there be a next step in finding his actual death certificate/death date? I surmise that he died before May of 1865 because of naming patterns in the family.